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I want a regular expression to match a-z, A-Z, 0-9, and space. For this particular situation, I do not want users to be allowed to input a tab character, or line feed, or form feed.
I know the following regular expression will do everything except the space requirement:
var alphaRE = /^[a-zA-Z0-9]+$/;
How do I change that regular expression to include just space characters?